It interested him then to instruct himself further in regard to the desert growths that had been strange to him; and to this end he led Margarita from one point to another, pleased to learn how familiar she was with every growing thing. Presently Margarita brought to Adam’s gaze a tree that resembled smoke, so blue-gray was it, so soft and hazy against the sky, so columnar and mushrooming. What a strange, graceful tree and what deep-blue blossoms it bore! Upon examination Adam was amazed to discover that every branch and twig of this tree was a thorn. A hard, cruel, beautiful tree of thorns that at a little distance resembled smoke! “_Palo Christi_,” murmured Margarita, making the sign of the cross. And she told Adam that this was the Crucifixion tree, which was the species that furnished the crown of thorns for the head of Christ. Sunset ended several happy and profitable hours for Adam. He had not forgotten about the Mexican, Felix, and had thought it just as well to let time pass and to keep out of trouble as long as he could. He and Margarita reached home without seeing any sign of Felix. Arallanes, however, had espied the Mexican sneaking around, and he warned Adam in no uncertain terms. Merryvale, too, had a word for Adam’s ear; and it was significant that he did not advise a waiting course. In spite of all Adam’s reflections he did not need a great deal of urging. After supper he started off for Picacho with Arallanes and a teamster who was freighting supplies up to the camp. Picacho was in full blast when they arrived. The dim lights, the discordant yells, the raw smell of spirits, the violence of the crude gambling hall worked upon Adam’s already excited mind; and by the time he had imbibed a few drinks he was ready for anything. But they did not find Felix. Then Adam, if not half drunk, at least somewhat under the influence of rum, started to walk back to his lodgings. The walk was long and, by reason of the heavy, dragging sand, one of considerable labor. Adam was in full possession of his faculties when he reached the village. But his blood was hot from the exercise, and the excitement of the prospective battle of the early evening had given way to an excitement of the senses, in the youthful romance felt in the dark, the starlight, the wildness of the place. So when in the pale gloom of the mesquites Margarita glided to him like a lissom spectre, to enfold him and cling and whisper, Adam had neither the will, nor the heart, nor the desire to resist her. CHAPTER V